Wind-resistant construction method suitable for arch bridge stiff framework

Abstract

The invention provides a wind-resistant construction method suitable for a stiff skeleton of an arch bridge, which is characterized in that a plurality of transverse wind cables are arranged on an arch rib frame at intervals, one end of each transverse wind cable is fixed on the arch rib frame, the other end of each transverse wind cable is fixed on a wind cable anchor cable, and the wind cable anchor cable is fixed on an anchor body; and the tensile force borne by the transverse wind cable is transmitted to the anchor body. The end, connected with the arch rib frame, of the transverse wind cable is fixed through a U-shaped buckle. According to the construction method, the bending angle of the wind cable anchor cable can be flexibly adjusted, the wind cable anchor cable is suitable for wind cables of all angles, the construction process is simple, safe and firm, mounting and dismounting are convenient, steel is saved, the material cost is saved, use and waste of a large amount of steel are avoided, tedious construction processes such as prestress steel beam tensioning are reduced, and the construction period is shortened.

Description

Technical Field

[0001] This invention belongs to the field of arch bridge construction technology, and in particular relates to a method for wind-resistant construction of the rigid frame of an arch bridge. Background Technology

[0002] During the installation of the rigid frame of the arch bridge, the structure is susceptible to unstable wind loads such as sudden gusts and continuous crosswinds due to the complex field working environment. The frame structure is prone to lateral displacement and vibration, which significantly increases the difficulty of controlling its lateral wind resistance and stability. This makes it difficult to meet the structural safety and precision control requirements during the construction phase, and poses potential risks to construction safety and project quality. Summary of the Invention

[0003] In view of this, the present invention aims to overcome the defects in the prior art and propose a wind-resistant construction method suitable for the rigid frame of arch bridges.

[0004] To achieve the above objectives, the technical solution created by this invention is implemented as follows: A method for wind-resistant construction of rigid frames for arch bridges is proposed, in which several transverse wind cables are installed at intervals on the arch rib frame. One end of the transverse wind cable is fixed to the arch rib frame, and the other end is fixed to the wind cable anchor. The wind cable anchor is fixed to the anchor body. The transverse wind cables resist the transverse wind force and transfer the tension on the transverse wind cables to the anchor body.

[0005] Furthermore, the end of the transverse wind cable connected to the arch rib frame is fixed by a U-shaped buckle.

[0006] Furthermore, the end of the transverse wind cable connected to the arch rib frame is wrapped around the steel pipe end of the arch rib frame once and then fixed with a U-shaped buckle.

[0007] Furthermore, after the transverse wind cable is wound around the steel pipe end of the arch rib frame, it is tightened using a chain hoist.

[0008] Furthermore, the transverse wind cables are arranged symmetrically along the center of the arch rib frame.

[0009] Furthermore, the rigid frame is hoisted to the corresponding segments, and after the anchor cables of the corresponding segments are tensioned, the corresponding transverse wind cables are installed respectively.

[0010] Furthermore, each bundle of the wind cable anchor is placed into the anchor hole via a guide rod.

[0011] Furthermore, the guide rod is made of steel bars.

[0012] Furthermore, two anchor holes are opened for each bundle of anchor cables.

[0013] Furthermore, a concrete pad is installed at the anchor hole.

[0014] Compared with existing technologies, the present invention has the following advantages: This invention provides a wind-resistant construction method suitable for the rigid frame of arch bridges. One end of the transverse wind cable is anchored in a rock anchor body using a wind cable anchor, and the other end is wrapped around the end of a steel pipe and anchored with a U-shaped clip. Compared with traditional methods of anchoring with pre-embedded steel components and prestressed anchoring, the wind cable anchor has a simpler structure, the bending angle of the wind cable anchor can be flexibly adjusted, it is suitable for wind cables at various angles, the construction process is simple, safe and reliable, and easy to install and dismantle. It also saves steel, reduces material costs, avoids the use and waste of large amounts of steel, reduces the cumbersome construction process such as prestressed steel strand tensioning, and shortens the construction period. Attached Figure Description

[0015] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This invention provides an elevation view of the transverse wind cable arrangement for the rigid frame of an arch bridge. Figure 2 This invention provides a plan view of the transverse wind cable arrangement for the rigid frame of an arch bridge. Figure 3 This invention provides a diagram illustrating the U-shaped snap-fit ​​connection structure. Figure 4 A schematic diagram of the wind cable anchor structure for this invention. Detailed Implementation

[0016] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0017] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0018] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0019] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] A method for wind-resistant construction of the rigid frame of an arch bridge, such as Figures 1 to 4 As shown, several transverse wind cables 3 are spaced apart on the arch rib frame 4. One end of the transverse wind cable is fixed to the arch rib frame, and the other end is fixed to the wind cable anchor 1. The wind cable anchor 1 is fixed to the anchor body 8. The transverse wind cables resist the transverse wind force and transfer the tension on the transverse wind cables to the anchor body. When the transverse wind force acts on the arch rib frame, the transverse wind cables can effectively transfer the tension generated by the wind force to the wind cable anchor 1, and then from the wind cable anchor 1 to the anchor body, thereby achieving resistance to the transverse wind force and maintaining the stability of the arch rib frame during construction.

[0021] One end of the transverse wind cable connecting to the arch rib frame is secured with a U-shaped clip. After the transverse wind cable is wrapped once around the end of the steel pipe 5 of the arch rib frame, it is then secured with a U-shaped clip 2. After the transverse wind cable is wrapped around the end of the steel pipe of the arch rib frame, it is tightened using a chain hoist. The transverse wind cable is passively stressed; therefore, by tensioning the transverse wind cable, under the action of strong winds on the rigid frame, the transverse wind cable restricts the transverse movement of the rigid frame. Figure 2 As shown, after the stiffening frame is hoisted to the corresponding segment and the anchor cables of the corresponding segment are tensioned, the corresponding transverse wind cables are installed. One end of the wind cable is wrapped around the end of the steel pipe of the corresponding segment of the stiffening frame once, and the transverse wind cable is tightened by a chain hoist. The upstream and downstream are tensioned and tightened symmetrically, and then the steel wire rope is anchored with 4 sets of U-shaped clips. The other end of the wind cable is anchored with a wind cable anchor made of steel wire rope. Each bundle of anchor cables is placed into two anchor holes through a large-diameter steel bar guide bar, and then the anchor cables are anchored to the rock anchor body by grouting.

[0022] The stable connection between the anchor body and the foundation bears and disperses the tension transmitted by the wind cable anchor, providing solid and stable support for the arch rib frame. The design and construction of the anchor body must fully consider factors such as the bearing capacity of the foundation and geological conditions. On solid foundations, the anchor body can adopt a relatively simple foundation form; however, in areas with poor geological conditions, such as soft soil foundations, it is necessary to use spread foundations, pile foundations, etc., to enhance the connection between the anchor body and the foundation and improve its bearing capacity. In harsh environments such as strong winds and canyons, a wind cable anchoring system is used. One end of the transverse wind cable is wrapped around the end of a steel pipe and anchored with a U-shaped clip, while the other end is anchored in the rock anchor body using a wind cable anchor. This construction process is simple, safe, reliable, and saves a significant amount of steel. Furthermore, the wind cable anchor structure is simple; the anchor cable made of steel wire rope can flexibly adjust the bending angle, making it suitable for wind cables at various angles.

[0023] Preferably, the transverse wind cables are arranged symmetrically along the center of the arch rib frame. When transverse wind force acts on the arch rib frame, the transverse wind cables, with their high strength and flexibility, resist the wind force by generating tension. The magnitude of this tension is closely related to factors such as the magnitude and direction of the wind force, as well as the arrangement angle of the transverse wind cables. For example, in areas with strong winds, increasing the number and strength of the transverse wind cables can effectively improve their wind resistance. A reasonable arrangement of the transverse wind cables can evenly distribute wind force, preventing excessive local stress on the arch rib frame, thus laying the foundation for the stable operation of the entire wind-resistant system.

[0024] The rigid frame is hoisted to the corresponding segment, and after the anchor cables of the corresponding segment are tensioned, the corresponding transverse wind cables are installed. Each bundle of the wind cable anchors is placed into the anchor hole 6 through the guide rod 9, and the anchor hole is filled with micro-expansion cement grout 7. The anchor body is usually set on a solid foundation. If the foundation conditions are poor, reinforcement treatment is required, such as using enlarged foundations or pile foundations, to enhance the stability of the anchor body.

[0025] The wind cable anchor connects the transverse wind cable to the anchor body and transmits the tensile force borne by the transverse wind cable. One end of the wind cable anchor is connected to the transverse wind cable to ensure smooth transmission of tensile force, while the other end is securely connected to the anchor body. The strength and stiffness of the wind cable anchor directly affect the efficiency and reliability of force transmission. Typically, high-strength steel strand is used as the wind cable anchor material, and its excellent tensile strength ensures that it will not break or deform excessively when subjected to huge tensile forces.

[0026] The guide rod is made of steel reinforcement. Two anchor holes are opened for each anchor cable bundle. A concrete pad 10 is installed at each anchor hole, and the guide rod is used to ensure that the transverse wind cable is as centered as possible in the hole. Under the action of wind force, the transverse wind cable, the wind cable anchor, and the anchor body form a closely connected and collaborative organic whole. When the transverse wind force is applied to the arch rib frame, the transverse wind cable is the first to be stressed, generating tension to resist the wind force. The tension on the transverse wind cable is transferred to the wind cable anchor through the connection point with the wind cable anchor.

[0027] After bearing tensile force, the wind-resistant cable anchor transmits it along its length to the anchor body. The anchor body, through its strong connection to the foundation, bears and distributes this tensile force. During this process, the magnitude and direction of the tensile force in the transverse wind cable are adjusted in real time according to changes in wind force, and the wind-resistant cable anchor also adjusts its force transmission state accordingly to ensure that the tensile force is accurately transmitted to the anchor body. Through its interaction with the foundation, the anchor body disperses the tensile force into the surrounding soil, thereby maintaining the balance and stability of the entire wind-resistant system. This collaborative mechanism enables the entire wind-resistant system to effectively cope with various complex wind conditions, ensuring the safety and stability of the arch bridge's rigid frame during construction.

[0028] This invention significantly improves the wind resistance of the arch bridge's rigid frame during construction by periodically installing transverse wind cables on the arch rib skeleton and connecting them to wind cable anchors and anchor bodies to form a wind-resistant system. The transverse wind cables directly bear the lateral wind force; through reasonable arrangement and selection, the wind force can be evenly distributed, avoiding excessive local stress on the arch rib skeleton, effectively reducing wind-induced vibration damage to the structure, and ensuring the integrity and stability of the structure during construction. The wind cable anchors, as force-transmitting components, reliably transfer the tension of the transverse wind cables to the anchor bodies. Their high strength and reliable connection method ensure the stability and continuity of force transmission, avoiding the risk of structural instability due to force transmission failure.

[0029] The anchorage is firmly rooted in the foundation, bearing and distributing enormous tensile forces, providing a solid support foundation for the entire wind-resistant system, enabling it to operate stably under various complex geological conditions. This collaborative wind-resistant construction method greatly ensures construction safety, reduces the possibility of construction accidents caused by strong winds, effectively guarantees project progress, reduces cost increases due to delays, and also lowers the risks throughout the construction process, providing a reliable guarantee for the smooth construction of the arch bridge's rigid framework.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for wind-resistant construction of the rigid frame of an arch bridge, characterized in that: Several transverse wind cables are installed at intervals on the arch rib frame. One end of the transverse wind cable is fixed to the arch rib frame, and the other end is fixed to the wind cable anchor. The wind cable anchor is fixed to the anchor body. The transverse wind cable resists the transverse wind force and transmits the tension on the transverse wind cable to the anchor body.

2. The method for wind-resistant construction of a rigid frame for arch bridges according to claim 1, characterized in that: The end of the transverse wind cable that connects to the arch rib frame is fixed by a U-shaped buckle.

3. The method for wind-resistant construction of a rigid frame for arch bridges according to claim 2, characterized in that: The end of the transverse wind cable that connects to the arch rib frame is wrapped around the steel pipe end of the arch rib frame once and then fixed with a U-shaped buckle.

4. A method for wind-resistant construction of a rigid frame for arch bridges according to claim 3, characterized in that: After the horizontal wind cable is wound around the steel pipe end of the arch rib frame, it is tightened using a chain hoist.

5. A method for wind-resistant construction of a rigid frame for arch bridges according to claim 1, characterized in that: The transverse wind cables are arranged symmetrically along the center of the arch rib frame.

6. The method for wind-resistant construction of a rigid frame for arch bridges according to claim 1, characterized in that: After the rigid frame is hoisted to the corresponding segment and the anchor cables of the corresponding segment are tensioned, the corresponding transverse wind cables are installed respectively.

7. A method for wind-resistant construction of a rigid frame for arch bridges according to claim 1, characterized in that: Each bundle of the wind cable anchor is placed into the corresponding anchor hole via a guide rod.

8. A method for wind-resistant construction of a rigid frame for arch bridges according to claim 7, characterized in that: The guide rod is made of steel bars.

9. A method for wind-resistant construction of a rigid frame for arch bridges according to claim 7, characterized in that: Two anchor holes are opened for each bundle of anchor cables.

10. A method for wind-resistant construction of a rigid frame for arch bridges according to claim 7 or 9, characterized in that: A concrete pad is installed at the anchor hole.

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